stall......good or bad from the roll???
04-03-2008, 08:12 AM
#42
The bigger the stall, the slower you'll be on the top end. All things equal the manual cars will always have a higher trap speed, and its gonna be even more evident on the street. IMO, a 4k stall is great at the track but useless on the street. Try to lauch a 4k stall on the street will only end-up frying the tires even with drag radials since the street is not a prepped racing surface. If you like racing from a roll then keep the stall speed low.
04-03-2008, 08:46 AM
#43
Now a locked converter more closely matches a 1-1 scenario between the crank and the tranny. You will get a higher HP number because now it takes the fluid coupler out of the equation. It still takes more power to push though an auto so the number will of course be less than an m6, but by locking the clutch, especially in a big stall you will see hp number typically 10% better than before. Locking up a converter in the top end of the track is a trick used to get more HP to the wheels since at that point more HP is better than TQ, and that equates to higher speeds. It's not recommended to lock up a single disk converter at WOT though, you will smoke through it sooner or later. The occasional dyno pull is ok though.
Generally speaking big stalls mean less peak HP on the dyno. Stalled Auto's are all about how the car uses what it has to the best of it's ability. That's why you can have a car that makes 400hp run 10's. Picking a torque converter is not as easy as saying I wan't a 3500 stall, there is alot more too it if you want the best one for the application. Generally speaking if you picked a stock TC and upped the rpms to say 3500 your car would be faster everywhere, due to the shift extension mostly.
Yank is one of the few companies to get the combo right in making a high STR converter and keeping the efficieny up as well.
04-03-2008, 10:30 AM
#44
The bigger the stall, the slower you'll be on the top end. All things equal the manual cars will always have a higher trap speed, and its gonna be even more evident on the street. IMO, a 4k stall is great at the track but useless on the street. Try to lauch a 4k stall on the street will only end-up frying the tires even with drag radials since the street is not a prepped racing surface. If you like racing from a roll then keep the stall speed low.
As for street launches, with a little footwork I can get out of the hole just fine. Fine enough to out-launch 99.9% of the cars I'll ever encounter on the street
. I just lean into the throttle at ~4000 RPM's until ~35 MPH then go WOT. Usually it'll hook by then, although occasionally it'll light em up. 6-speed, LT's, TD's, lid, ported TB, tuned, traps 110.
04-03-2008, 01:20 PM
#45
Absolutely not true at all. Have you been reading the posts in this thread? I will take my PT4400 over my old ST3500 or SS4000 on the street any day. It has superior performance over those two in every aspect IMO.....daily driving, highway and track. Before I got the PT4400, I would have taken the SS4000 over the ST3500 any day.
As for street launches, with a little footwork I can get out of the hole just fine. Fine enough to out-launch 99.9% of the cars I'll ever encounter on the street. I just lean into the throttle at ~4000 RPM's until ~35 MPH then go WOT. Usually it'll hook by then, although occasionally it'll light em up.
6-speed, LT's, TD's, lid, ported TB, tuned, traps 110.
As for street launches, with a little footwork I can get out of the hole just fine. Fine enough to out-launch 99.9% of the cars I'll ever encounter on the street
. I just lean into the throttle at ~4000 RPM's until ~35 MPH then go WOT. Usually it'll hook by then, although occasionally it'll light em up. 6-speed, LT's, TD's, lid, ported TB, tuned, traps 110.
did you ever race this car with the PT converter in before you had the cam in place? it seems like your modifications may be fairly close besides the cam.
04-03-2008, 03:06 PM
#46
Absolutely not true at all. Have you been reading the posts in this thread? I will take my PT4400 over my old ST3500 or SS4000 on the street any day. It has superior performance over those two in every aspect IMO.....daily driving, highway and track. Before I got the PT4400, I would have taken the SS4000 over the ST3500 any day.
As for street launches, with a little footwork I can get out of the hole just fine. Fine enough to out-launch 99.9% of the cars I'll ever encounter on the street. I just lean into the throttle at ~4000 RPM's until ~35 MPH then go WOT. Usually it'll hook by then, although occasionally it'll light em up.
As for street launches, with a little footwork I can get out of the hole just fine. Fine enough to out-launch 99.9% of the cars I'll ever encounter on the street
. I just lean into the throttle at ~4000 RPM's until ~35 MPH then go WOT. Usually it'll hook by then, although occasionally it'll light em up.
04-03-2008, 05:43 PM
#47
I added the PT after the cam....it felt like I gained more from adding the converter than it did from adding the cam if you can believe that.
My point is simple.....in my personal experience with three converters (ST3500, SS4000 and PT4400), each one was larger than the last and each one offered a obvious performance gain. No stalled A4 that I've ridden in or driven has had as much pull as the PT series. It's big, it's loose, and it's the answer to all my converter questions!!
Last edited by 99Hawk262; 04-03-2008 at 05:50 PM.
04-04-2008, 06:37 AM
#49
Locking up ANY lockup converter in the top end (3rd) will gain some speed for the reasons I said in my earlier post.
(BTW if you are wondering why I got a 4000 stall w/ a 1.69 STR it is because I did not know at the time)
08-31-2008, 11:18 PM
#56
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I know this is pretty random but wouldn't gears help in this case? If you were to go from the 3.23s to lets say a set of 3.90's (just using that ratio as an example) because of the increase in gear it would accelerate the car faster which in turn would help you from a roll? I know the taller the gear you loose alittle more top end from from lower roll speeds you would want something to punch faster....
09-01-2008, 12:42 PM
#57
I know M6s are almost always going to be better from a roll , but they thought an A4 could never beat a M6 from a roll [you know, 10 out of 10 times, lol ] and you helped me prove them wrong. That's all.
09-01-2008, 12:42 PM
#58
I know this is pretty random but wouldn't gears help in this case? If you were to go from the 3.23s to lets say a set of 3.90's (just using that ratio as an example) because of the increase in gear it would accelerate the car faster which in turn would help you from a roll? I know the taller the gear you loose alittle more top end from from lower roll speeds you would want something to punch faster....
